ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika
Vol 14, No 2: Published April 2026

Enhancing Isolation Forest with Threshold-based Filtering and LSTM for Attendance Anomaly Detection

SUGIANTORO, ZULLVAN (Unknown)
LIONNIE, REGINA (Unknown)



Article Info

Publish Date
29 Apr 2026

Abstract

The research discusses the simulation of a GPS-based attendance coordinate point authenticity verification system. Verification is carried out using the Isolation Forest model to detect outliers based on distance anomalies between entry and exit attendances and total path anomalies combined with Threshold-based Filtering to determine the normal distance threshold, and LSTM to analyze temporal patterns based on the total recorded path. The test results show that the combination of Threshold-based Filtering, Isolation Forest, and Long Short-Term Memory (LSTM) is able to detect invalid coordinate points accurately, from this combination obtained accuracy results of 99.74%, precision 99,49%, recall 100% and F1-score 99,74%. These results prove that the performance of the model combination (hybrid) is superior to using each component model separately.

Copyrights © 2026






Journal Info

Abbrev

elkomika

Publisher

Subject

Electrical & Electronics Engineering Engineering

Description

Jurnal ELKOMIKA diterbitkan 3 (tiga) kali dalam satu tahun pada bulan Januari, Mei dan September. Jurnal ini berisi tulisan yang diangkat dari hasil penelitian dan kajian analisis di bidang ilmu pengetahuan dan teknologi, khususnya pada Teknik Energi Elektrik, Teknik Telekomunikasi, dan Teknik ...